/**
 * Subset of the NestJS `LoggerService` interface implemented by
 * {@link createNestJsonLogger}. Mirrors Nest's expected logger contract so the
 * JSON logger can be passed directly to a Nest application.
 */
export interface LoggerService {
    log(message: any, ...optionalParams: any[]): any;
    error(message: any, ...optionalParams: any[]): any;
    warn(message: any, ...optionalParams: any[]): any;
    debug?(message: any, ...optionalParams: any[]): any;
    verbose?(message: any, ...optionalParams: any[]): any;
    fatal?(message: any, ...optionalParams: any[]): any;
    setLogLevels?(levels: any[]): any;
}
/**
 * Creates a NestJS-compatible {@link LoggerService} that emits one JSON object
 * per line to `process.stdout`. When the final optional parameter is a string,
 * it is treated as Nest's `context` argument and recorded separately; remaining
 * params are joined into the message, with `Error` values reduced to their
 * message.
 *
 * @returns A logger implementing Nest's `log`/`error`/`warn`/`debug`/`verbose`/`fatal` methods
 * @example
 * ```typescript
 * const app = await NestFactory.create(AppModule, { logger: createNestJsonLogger() })
 * ```
 */
declare function createNestJsonLogger(): LoggerService;
/**
 * The logger type produced by {@link createNestJsonLogger}.
 */
type NestJsonLogger = ReturnType<typeof createNestJsonLogger>;
export { createNestJsonLogger, type NestJsonLogger };
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